Web Reference: Jan 9, 2024 · A quick and practical guide to creating collections and maps using Java 9 factory methods. Jul 23, 2025 · The JDK 9 has added static factory methods like of () onto basic Collection interfaces, to create unmodifiable collection objects. These are the same as the unmodifiable (immutable) collection we create in JDK 6, 7, 8. Apr 21, 2017 · The arrival of Java 9 brings many new features to Java's Collections API, one of which being collection factory methods. What are they and how can I implement them properly?
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